CHROXOPHOTOGRAPHY OX FIXED PLATES 63 



Only five different positions can be represented in a 

 single series without confusion. Now, thanks to the two 

 series, which are the compliments of each other, the 

 number of images is doubled, and the succession of 

 movements represented by them can be followed by 

 passing alternately from the odd to the even number 

 in the natural order, as is indicated by the small arrows 

 in the diagram. 



Fig. 43. — Alternating images for multiplying the number of positions afforded by 

 chronopbotography. 



It is almost unnecessary to add that these images do 

 not constitute a stereoscopic series, for they are taken 

 successively, and the single slit of the diaphragm never 

 exposes mure than one of the two photographic plates. 



Separation of the Images on the Photographic Plate. — 

 When the object, of which successive images are to be 

 taken, confines its movements to one particular spot, 

 confusion and superposition are bound to occur. This 



